Colors Encyclopedia

Named color

Cobalt Blue

Cobalt Blue is a jewel tone blue color with HEX #0047AB. According to Colors Encyclopedia, it has RGB 0, 71, 171, HSL 215, 100%, 34%, cool temperature, and is useful for interfaces, brand systems, and technical design.

#0047AB blue cool jewel-tone
HEX #0047AB
RGB rgb(0, 71, 171)
HSL hsl(215 100% 34%)
CMYK cmyk(100, 58, 0, 33)
Luminance 0.0745
Contrast Black 2.49:1White 8.43:1

CSS Utilities

--color-cobalt-blue: #0047AB;
.bg-cobalt-blue { background-color: #0047AB; }
.text-cobalt-blue { color: #0047AB; }
Open CSS utility pageReusable variables, classes, examples, and implementation notes

Machine-readable data

Machine-Readable Color Data (JSON)

Perfect for CSS, design systems, automation, and AI ingestion.

AI-Ready Dataset v1.0.0
Luminance0.0745
Black text2.49:1AA Fail
White text8.43:1AA Pass
hexCanonical HEX value
rgbRed, green, blue channels
hslHue, saturation, lightness
cmykApproximate print conversion
wcagAA and AAA contrast options
harmoniesMathematical harmony sets
variantsGenerated tone variants
nearestColorsKnowledge graph neighbors
Download JSON Open API
Structured sections
Color systems
{
  "hex": "#0047AB",
  "rgb": [
    0,
    71,
    171
  ],
  "hsl": [
    215,
    100,
    34
  ],
  "cmyk": [
    100,
    58,
    0,
    33
  ],
  "luminance": 0.0745,
  "contrast": {
    "black": 2.49,
    "white": 8.43
  }
}
WCAG
{
  "AA": [
    "#FFFFFF",
    "#F5F5F5"
  ],
  "AAA": [
    "#FFFFFF",
    "#F5F5F5"
  ]
}
Harmonies
{
  "complementary": "#AD6500",
  "analogous": [
    "#009FAD",
    "#0E00AD"
  ],
  "triadic": [
    "#AD0048",
    "#48AD00"
  ],
  "tetradic": [
    "#AD009F",
    "#AD6500",
    "#00AD0E"
  ],
  "splitComplementary": [
    "#AD0E00",
    "#9FAD00"
  ],
  "monochromatic": [
    "#0A70FF",
    "#0047AB",
    "#002252"
  ]
}
Variants
{
  "light": "#0A70FF",
  "dark": "#002252",
  "saturated": "#0048AD",
  "desaturated": "#134B9A",
  "pastel": "#3E88EF",
  "neon": "#0059D6"
}
Pairings
{
  "best": [
    "#FFFFFF",
    "#AD6500",
    "#009FAD",
    "#0E00AD"
  ],
  "avoid": [
    "#134B9A",
    "#0A70FF"
  ],
  "neutral": [
    "#1A1A1A",
    "#F5F5F5",
    "#E8E8E4"
  ],
  "highContrast": [
    "#FFFFFF"
  ],
  "lowContrast": [
    "#0A70FF",
    "#134B9A"
  ]
}
Knowledge graph
{
  "nearestColors": [
    "signal-blue",
    "sapphire",
    "egyptian-blue",
    "smalt",
    "safety-blue"
  ],
  "generatedPalettes": [
    "cobalt-blue"
  ],
  "generatedComparisons": [
    "cobalt-blue-vs-sapphire",
    "cobalt-blue-vs-signal-blue",
    "smalt-vs-cobalt-blue"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/cobalt-blue",
    "/wcag/cobalt-blue",
    "/css/colors/cobalt-blue",
    "/hex/0047ab"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/cobalt-blue"
    ],
    "related": [
      "/colors/signal-blue",
      "/colors/sapphire",
      "/colors/egyptian-blue",
      "/colors/smalt",
      "/colors/safety-blue",
      "/compare/cobalt-blue-vs-sapphire",
      "/compare/cobalt-blue-vs-signal-blue",
      "/compare/smalt-vs-cobalt-blue",
      "/harmonies/cobalt-blue",
      "/wcag/cobalt-blue",
      "/css/colors/cobalt-blue",
      "/hex/0047ab"
    ]
  }
}
Full JSON dataset 
{
  "slug": "cobalt-blue",
  "name": "Cobalt Blue",
  "hex": "#0047AB",
  "uses": [
    "interfaces",
    "brand systems",
    "technical design"
  ],
  "psychology": {
    "associations": [
      "trust",
      "clarity",
      "calm"
    ],
    "contexts": [
      "technology",
      "finance",
      "healthcare",
      "navigation"
    ],
    "avoidIn": [
      "high-warmth food palettes"
    ]
  },
  "aliases": [
    "cobalt"
  ],
  "sourceType": "curated",
  "confidence": "medium",
  "reviewStatus": "manual",
  "sourceUrl": "https://www.colorsencyclopedia.com/assets/colors.json",
  "origin": {
    "type": "common",
    "notes": "Curated common color reference used in design and editorial color systems."
  },
  "family": "blue",
  "temperature": "cool",
  "tone": [
    "jewel-tone"
  ],
  "editorialNotes": "Curated internal color record with computed technical properties.",
  "tags": [
    "blue",
    "cool",
    "jewel-tone",
    "interfaces",
    "brand-systems",
    "technical-design",
    "trust",
    "clarity",
    "calm"
  ],
  "popularity": 88,
  "rgb": [
    0,
    71,
    171
  ],
  "hsl": [
    215,
    100,
    34
  ],
  "cmyk": [
    100,
    58,
    0,
    33
  ],
  "luminance": 0.0745,
  "contrast": {
    "black": 2.49,
    "white": 8.43
  },
  "harmonies": {
    "complementary": "#AD6500",
    "analogous": [
      "#009FAD",
      "#0E00AD"
    ],
    "triadic": [
      "#AD0048",
      "#48AD00"
    ],
    "tetradic": [
      "#AD009F",
      "#AD6500",
      "#00AD0E"
    ],
    "splitComplementary": [
      "#AD0E00",
      "#9FAD00"
    ],
    "monochromatic": [
      "#0A70FF",
      "#0047AB",
      "#002252"
    ]
  },
  "variants": {
    "light": "#0A70FF",
    "dark": "#002252",
    "saturated": "#0048AD",
    "desaturated": "#134B9A",
    "pastel": "#3E88EF",
    "neon": "#0059D6"
  },
  "wcag": {
    "AA": [
      "#FFFFFF",
      "#F5F5F5"
    ],
    "AAA": [
      "#FFFFFF",
      "#F5F5F5"
    ]
  },
  "css": {
    "variable": "--color-cobalt-blue: #0047AB;",
    "utility": ".bg-cobalt-blue { background-color: #0047AB; }",
    "textUtility": ".text-cobalt-blue { color: #0047AB; }"
  },
  "nearestColors": [
    "signal-blue",
    "sapphire",
    "egyptian-blue",
    "smalt",
    "safety-blue"
  ],
  "generatedPalettes": [
    "cobalt-blue"
  ],
  "generatedComparisons": [
    "cobalt-blue-vs-sapphire",
    "cobalt-blue-vs-signal-blue",
    "smalt-vs-cobalt-blue"
  ],
  "relatedFamilies": [
    "/colors/by-family/blue",
    "/colors/by-temperature/cool",
    "/colors/by-tone/jewel-tone"
  ],
  "relatedTools": [
    "/harmonies/cobalt-blue",
    "/wcag/cobalt-blue",
    "/css/colors/cobalt-blue",
    "/hex/0047ab"
  ],
  "semanticRelations": {
    "broader": [
      "/colors/by-family/blue",
      "/colors/by-temperature/cool",
      "/colors/by-tone/jewel-tone"
    ],
    "narrower": [
      "/palettes/cobalt-blue"
    ],
    "related": [
      "/colors/signal-blue",
      "/colors/sapphire",
      "/colors/egyptian-blue",
      "/colors/smalt",
      "/colors/safety-blue",
      "/compare/cobalt-blue-vs-sapphire",
      "/compare/cobalt-blue-vs-signal-blue",
      "/compare/smalt-vs-cobalt-blue",
      "/harmonies/cobalt-blue",
      "/wcag/cobalt-blue",
      "/css/colors/cobalt-blue",
      "/hex/0047ab"
    ]
  },
  "pairings": {
    "best": [
      "#FFFFFF",
      "#AD6500",
      "#009FAD",
      "#0E00AD"
    ],
    "avoid": [
      "#134B9A",
      "#0A70FF"
    ],
    "neutral": [
      "#1A1A1A",
      "#F5F5F5",
      "#E8E8E4"
    ],
    "highContrast": [
      "#FFFFFF"
    ],
    "lowContrast": [
      "#0A70FF",
      "#134B9A"
    ]
  }
}
Dataset manifest Version 1.0.0 Build hash published in manifest Canonical page

Color meaning and use

About Cobalt Blue Color

Cobalt Blue sits in the blue family with cool temperature and jewel tone visual character. Cobalt Blue is a commonly used color name in design references, palettes, and editorial color systems.

Its common associations include trust, clarity, and calm, which makes it relevant for technology and finance. In design work, Cobalt Blue is most useful for interfaces, brand systems, and technical design, especially when paired with white text for stronger contrast.

Related Color Guides

Blue color familyBrowse named blue colors and compare nearby swatches.Cool colorsExplore colors with cool temperature behavior.Jewel Tone colorsFind colors with jewel tone visual character.Cobalt Blue accessibilityCheck contrast and WCAG text options for #0047AB.Cobalt Blue CSS utilitiesUse Cobalt Blue in CSS variables and utility classes.#0047AB HEX atlasOpen the permanent HEX atlas record for conversions and variants.Cobalt Blue paletteOpen the generated palette based on Cobalt Blue.Cobalt Blue harmoniesExplore complementary, analogous, triadic, and tetradic harmonies.

WCAG Accessibility

Contrast checks for Cobalt Blue against black and white text.

Black text2.49:1AA Fail
White text8.43:1AA Pass
AA text options#FFFFFF, #F5F5F5
AAA text options#FFFFFF, #F5F5F5
Open WCAG pageDetailed contrast notes, warnings, alternatives, and UI examples

Similar Colors

Signal Blue#0057B8
Sapphire#0F52BA
Egyptian Blue#1034A6
Smalt#003399
Safety Blue#0067A5

Color Harmonies

#AD6500#AD6500
#009FAD#009FAD
#0E00AD#0E00AD
#AD0048#AD0048
#48AD00#48AD00
Open full Cobalt Blue harmony pageComplementary, analogous, triadic, tetradic, split, and monochromatic sets

Variants

#0A70FF#0A70FF
#002252#002252
#0048AD#0048AD
#134B9A#134B9A
#3E88EF#3E88EF
#0059D6#0059D6

Pairings

White#FFFFFF
#AD6500#AD6500
#009FAD#009FAD
#0E00AD#0E00AD
Matte Black#1A1A1A
White Smoke#F5F5F5